class Container {
	static of (value) {
		return new Container(value)
	}
	constructor(value) {
		this._value = value
	}
	map (fn) {
		return Container.of(fn(this._value))
	}
}

class Maybe {
	static of (value) {
		return new Maybe(value)
	}

	constructor(value) {
		this._value = value
	}

	isNothing () {
		return this._value === null || this._value === undefined
	}

	map (fn) {
		return this.isNothing() ? this : Maybe.of(fn(this._value))
	}
}

module.exports = { Maybe, Container }
